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How is a 01/09 min of -29 C and a 01/10 max of -57 C physically possible?

Greenland is influenced by the Gulf Stream nearby and also this is at high elevation so upper atmosphere movement from either the Labrador Current or the Gulf Stream may shift temperatures rapidly from day to day if the Greenland High gets weaker, unlike a Verkhoyansk or Oymyakon stuck in a valley on low elevation. At least, that's my theory.

Anyway, it depends a lot on what timeframes you're working with. In Sweden we go with 6 am and 6 pm as isotherms for days. If Greenland does the same, then a sudden dropoff during the evening may be recorded as the next day. I don't know exactly how that works. Anyway, I don't think it'll have a -29°C low on that day, it may well be a typo.

Next 7 days in "Continental Western Canada/Upper Midwest" (beneath -10°C winter means but not tundra) and Alaska:

Generally close to averages, except in Anchorage where it is warmer and Duluth where the lows are a lot warmer than normal. Winnipeg on the other hand has rather low diurnals, with highs being colder than normal, but lows less severe than expected for January. Interestingly, that also occurs for Gimli farther north along Lake Winnipeg.

Next 7 days in "Continental Western Canada/Upper Midwest" (beneath -10°C winter means but not tundra) and Alaska:

Generally close to averages, except in Anchorage where it is warmer and Duluth where the lows are a lot warmer than normal. Winnipeg on the other hand has rather low diurnals, with highs being colder than normal, but lows less severe than expected for January. Interestingly, that also occurs for Gimli farther north along Lake Winnipeg.

I know it's not technically El Nino but it's sure playing out like an El Nino year here. We still haven't dropped below -30°C which is unusual. The last time we had a winter that failed to drop below -30°C was the El Nino winter of 2015-2016. Prior to that you have to go all the way back to the strong El Nino of 1991-92 to find a winter that failed to dip below -30°C. With almost half of meteorological winter gone I'd say we stand a reasonable chance of repeating.

I know it's not technically El Nino but it's sure playing out like an El Nino year here. We still haven't dropped below -30°C which is unusual. The last time we had a winter that failed to drop below -30°C was the El Nino winter of 2015-2016. Prior to that you have to go all the way back to the strong El Nino of 1991-92 to find a winter that failed to dip below -30°C. With almost half of meteorological winter gone I'd say we stand a reasonable chance of repeating.

What do you say about the prospective -22/-32 day for Edmonton right at the end of Weatheronline's 8-day forecast? It looks like a strong shift on the prairies within one week. Polar outbreak and northerlies gaining momentum? On the other hand, Edmonton is a really strange climate in winter, often deviating from averages. Apparently a -18/-19 day next week is also possible, that must be quite rare that far inland with non-existent diurnals like that?

What do you say about the prospective -22/-32 day for Edmonton right at the end of Weatheronline's 8-day forecast? It looks like a strong shift on the prairies within one week. Polar outbreak and northerlies gaining momentum? On the other hand, Edmonton is a really strange climate in winter, often deviating from averages. Apparently a -18/-19 day next week is also possible, that must be quite rare that far inland with non-existent diurnals like that?

I buy that -22/-32 will happen. That far out I trust the Euro model more and ECMWF has the colder air going much further east.

We certainly do get cold days with low diurnals from time to time. A one degree range would be unusual but certainly ranges of 2 or 3 degrees with cold temperatures (i.e. subzero Fahrenheit) can happen a few times a winter. They usually happen near the start of a cold spell when there's a surface low in conjunction with the arctic front creating cloud cover and/or snow. Last February 2 for example the range was -18.8/-21.0°C; two days later it was -39°C.

I buy that -22/-32 will happen. That far out I trust the Euro model more and ECMWF has the colder air going much further east.

We certainly do get cold days with low diurnals from time to time. A one degree range would be unusual but certainly ranges of 2 or 3 degrees with cold temperatures (i.e. subzero Fahrenheit) can happen a few times a winter. They usually happen near the start of a cold spell when there's a surface low in conjunction with the arctic front creating cloud cover and/or snow. Last February 2 for example the range was -18.8/-21.0°C; two days later it was -39°C.

That seems to match what's forecast to happen next week rather well, it will be interesting to see whether this will result in a cold wave or merely will remain a cold snap. Here instead, at a higher latitude but by the sea, low diurnals are a regular occurence in winter, but most often ends up when the maritime air overtakes the subarctic dry background air. While Nyköping's warmed by the Gulf Stream influence, the low-pressure maritime influence has to be massive. Moving just 130 km inland where I was at University, the first sign of a clear afternoon sky meant instant dips towards -10°C this time of the year.

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